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Cognomen Taddei (Taddei , טאדיי , Таддеи ) , across the world, is quite a common family name. The cognomen Taddei is characteristic of San Marino, where it is a common surname, British Virgin Islands, where it is quite a common surname, and Italy, where it is quite a rare surname. In absolute terms, it is the most numerous in Italy, France, and the United States. Very seldom, Taddei is the forename as well as the last name.